Senior Backend Developer - WDK (100% Remote - Spain)

Bitfinex; Barcelona; A distancia; EUR 50.000 - 80.000; Jornada completa

Descripción de la vacante

Join a leading company in the fintech space as a Senior Backend Developer focused on the Wallet Development Kit (WDK). You will contribute to building self-custodial wallet applications and ensure the security and scalability of backend services. This remote role in Barcelona offers the chance to work with innovative technologies and make a significant impact in digital finance.

Formación

• Experience with crypto wallets or DeFi.
• Familiarity with modular architecture for scalable applications.
• Strong understanding of security standards.

Responsabilidades

• Contribute to the creation of projects using agile methodologies.
• Ensure backend services are responsive and scalable.
• Uphold security standards in backend processes.

Conocimientos

Agile methodologies

Security practices

Scalability

Complex platform development

Quick learner

Herramientas

Go

Rust

C++

Descripción del empleo

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Senior Backend Developer - WDK (100% Remote - Spain), Barcelona

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Location:

Barcelona, Spain

Job Category:

-

EU work permit required:

Yes

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Job Reference:

Job Views:

1

Posted:

04.06.2025

Expiry Date:

19.07.2025

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Job Description:

Join Tether and Shape the Future of Digital Finance
At Tether, we’re not just building products, we’re pioneering a global financial revolution. Our cutting-edge solutions empower businesses—from exchanges and wallets to payment processors and ATMs—to seamlessly integrate reserve-backed tokens across blockchains. By harnessing the power of blockchain technology, Tether enables you to store, send, and receive digital tokens instantly, securely, and globally, all at a fraction of the cost. Transparency is the bedrock of everything we do, ensuring trust in every transaction.

Innovate with Tether
Tether Finance: Our innovative product suite features the world’s most trusted stablecoin, USDT, relied upon by hundreds of millions worldwide, alongside pioneering digital asset tokenization services.
But that’s just the beginning:Tether Power: Driving sustainable growth, our energy solutions optimize excess power for Bitcoin mining using eco-friendly practices in state-of-the-art, geo-diverse facilities.
Tether Data: Fueling breakthroughs in AI and peer-to-peer technology, we reduce infrastructure costs and enhance global communications with cutting-edge solutions like KEET, our flagship app that redefines secure and private data sharing.
Tether Education: Democratizing access to top-tier digital learning, we empower individuals to thrive in the digital and gig economies, driving global growth and opportunity.
Tether Evolution: At the intersection of technology and human potential, we are pushing the boundaries of what is possible, crafting a future where innovation and human capabilities merge in powerful, unprecedented ways.

Why Join Us?
Our team is a global talent powerhouse, working remotely from every corner of the world. If you’re passionate about making a mark in the fintech space, this is your opportunity to collaborate with some of the brightest minds, pushing boundaries and setting new standards. We’ve grown fast, stayed lean, and secured our place as a leader in the industry.
If you have excellent English communication skills and are ready to contribute to the most innovative platform on the planet, Tether is the place for you.
Are you ready to be part of the future?

About the job

The Wallet Development Kit (WDK) Software Engineer contributes to Tether's open-sourcetoolkit for building self-custodial wallet applications across mobile and desktop platforms.This position involves technical design, implementation, and collaboration with other
teams to advance the toolkit's capabilities. Prior experience with the creation of wallets orin DeFi will be beneficial.

Responsibilities

• Innovative Solutions: Contribute to the creation of groundbreaking projects,utilizing agile methodologies and innovative technologies to create incredibleplatforms.
• Scalability: Ensure backend services remain effortlessly responsive and real-time,accommodating the platform's continual growth and evolving user base.
• Security: Uphold the highest security standards in all backend processes andservices to safeguard our users' assets and data.

Past experience building or integrating crypto wallets for DeFi and blockchain applications.

Modular Architecture: Familiarity with modular architecture for scalableapplications.

Complex Platform Development: Experience in actively developing complexplatforms and APIs.

Quick Learner: Ability to quickly adapt and learn new technologies.

Security Awareness: Strong understanding and experience implementing bestsecurity practices.

Nice to have

High-Availability Concepts: Experience with high-availability concepts and bestpractices for ensuring system reliability.

Additional Programming Skills: Knowledge of Go, Rust, or C++ is advantageous.

Familiarity with message queues (Redis), caches, andjob queues.

Mobile Development: Experience in React Native, Flutter or Native mobiledevelopment.